I renewed my Basic Class 2 today. So easy, printed the form, went to my GP, who bulk bills, he filled in his bits, and signed and stamped it.
Completed the online bit in MyCasa, paid my $10 and voila... Basic Class 2 issued, and emailed.
Yes, Class 5 is easier, but the Basic Class 2 is pretty easy (and cheap) also.
Disclaimer - I'm 53 with no medical conditions.